Study on accelerated endurance test of cooling module under strengthening bad circuit condition
An accelerated test power spectrum editing method is proposed.Based on the road test load spectrum of a commercial vehicle,by analyzing the frequency domain characteristics of each road condition and referring to the calculated modal results of the cooling module,the risk road conditions leading to the failure of the cooling module were confirmed.The fatigue damage spectrum components of each road condition were calculated based on the collected load signals,the total fatigue damage was obtained by using Miner's linear superposition theory.Finally,the power spectrum for bench acceleration test is generated.With the acceleration spectrum compared and verified through time domain,amplitude domain and frequency domain angles,the data shows that the statistical characteristics of the accelerated spectrum are consistent with the original spectrum.The bench endurance test of cooling module shows that the enhanced vibration magnitude by 1.85 times,hundreds of hours of road tests on three risky conditions can be shortened to 57 hours of bench test,and reproduce failures in the road test,which verifies the effectiveness.
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